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Thu, 14 May 2026 15:24:32 +0000 (GMT) Received: from li-7bb28a4c-2dab-11b2-a85c-887b5c60d769.ibm.com.com (unknown [9.124.213.185]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 14 May 2026 15:24:32 +0000 (GMT) From: Shrikanth Hegde To: linux-kernel@vger.kernel.org, mingo@kernel.org, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, yury.norov@gmail.com, kprateek.nayak@amd.com, iii@linux.ibm.com Cc: sshegde@linux.ibm.com, tglx@kernel.org, gregkh@linuxfoundation.org, pbonzini@redhat.com, seanjc@google.com, vschneid@redhat.com, huschle@linux.ibm.com, rostedt@goodmis.org, dietmar.eggemann@arm.com, mgorman@suse.de, bsegall@google.com, maddy@linux.ibm.com, srikar@linux.ibm.com, hdanton@sina.com, chleroy@kernel.org, vineeth@bitbyteword.org, frederic@kernel.org, arighi@nvidia.com, pauld@redhat.com, christian.loehle@arm.com, tj@kernel.org, tommaso.cucinotta@gmail.com, maz@kernel.org, rafael@kernel.org Subject: [PATCH v3 12/20] sched/debug: Add migration stats due to non preferred CPUs Date: Thu, 14 May 2026 20:51:56 +0530 Message-ID: <20260514152204.481115-13-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260514152204.481115-1-sshegde@linux.ibm.com> References: <20260514152204.481115-1-sshegde@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: 3eTLqQqSJl2KQHQKdPwJfLFLBrFLx_v8 X-Proofpoint-GUID: Z4GjLyej7u2G24cvm52iak5ZvehzZAOM X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTE0MDE1MyBTYWx0ZWRfXxndfJ1aUOe+R 0K6cl+GUlUtP9pShBD30QrOclSiLkcwiwdVPVv69oIt7PixsLa9bMnBR6RgaDhgAZFlDAdMD3Z1 8+o6fIznvbIZRWKjgg7akqwlSyLadWfw+2dSN3jGblydzBPVk4WG4gZrH8J7npD8qdEy0PeBztc k2QRcdtjLDy3hcSqLnm+rBCbWg/wIlqqlq7QcFDiv6z43oD5sGS2oVlyrXvDEHUzlH5h8uQg8Ow D4XjP08u/sDD9uBZ7DgDYmpDzRlwkS7L3Ay5yFOMdJOmhmrSrAJ2HqbN58NIV8dGj6Om864FV9Q FuJuLo2iXEDHogCObclubQ4GIlVYqnC3WjSniHA2DVNB78rvnO/m4+RcOliKrcY0qJU5vdmgYmk g0BI77lJjTAGrBhDoILzdm5mJWpas0zhLtnJtPY3TexzlalefMs8x6INdi/R39NPnnuU9fpVZ8y iHB3qJkI2CU7jwUQbew== X-Authority-Analysis: v=2.4 cv=P8UKQCAu c=1 sm=1 tr=0 ts=6a05e93d cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=-i9lZGrASMRMKgkbeRgA:9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-14_03,2026-05-13_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 priorityscore=1501 phishscore=0 bulkscore=0 clxscore=1015 malwarescore=0 spamscore=0 lowpriorityscore=0 suspectscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605050000 definitions=main-2605140153 Add new stats. - nr_migrations_cpu_non_preferred: number of migrations happened since a CPU was marked as non preferred due to high steal time. Signed-off-by: Shrikanth Hegde --- include/linux/sched.h | 1 + kernel/sched/core.c | 1 + kernel/sched/debug.c | 1 + 3 files changed, 3 insertions(+) diff --git a/include/linux/sched.h b/include/linux/sched.h index 2c3ad3e0edb5..dcfb57c90850 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -554,6 +554,7 @@ struct sched_statistics { u64 nr_failed_migrations_running; u64 nr_failed_migrations_hot; u64 nr_forced_migrations; + u64 nr_migrations_cpu_non_preferred; u64 nr_wakeups; u64 nr_wakeups_sync; diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 508773e71929..0d1995c65ce6 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -11287,6 +11287,7 @@ static int sched_non_preferred_cpu_push_stop(void *arg) if (task_rq(p) == rq && task_on_rq_queued(p)) { cpu = select_fallback_rq(rq->cpu, p); rq = __migrate_task(rq, &rf, p, cpu); + schedstat_inc(p->stats.nr_migrations_cpu_non_preferred); } rq_unlock(rq, &rf); diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index f8a43fc13564..482c86a0ff80 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -1305,6 +1305,7 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns, P_SCHEDSTAT(nr_failed_migrations_running); P_SCHEDSTAT(nr_failed_migrations_hot); P_SCHEDSTAT(nr_forced_migrations); + P_SCHEDSTAT(nr_migrations_cpu_non_preferred); P_SCHEDSTAT(nr_wakeups); P_SCHEDSTAT(nr_wakeups_sync); P_SCHEDSTAT(nr_wakeups_migrate); -- 2.47.3